GCC 4.5 compatibility: cannot default constructor in class body.

src/AbstractObject.h

@@ -61,8 +61,8 @@ class MAGNUM_EXPORT AbstractObject {
         static Int maxLabelLength();
 
     protected:
-        MAGNUM_LOCAL AbstractObject() = default;
+        MAGNUM_LOCAL AbstractObject();
-        MAGNUM_LOCAL ~AbstractObject() = default;
+        MAGNUM_LOCAL ~AbstractObject();
 
     private:
         static MAGNUM_LOCAL void labelImplementationNoOp(GLenum, GLuint, const std::string&);
@@ -73,6 +73,9 @@ class MAGNUM_EXPORT AbstractObject {
         static MAGNUM_LOCAL std::string getLabelImplementationKhr(GLenum identifier, GLuint name);
 };
 
+inline AbstractObject::AbstractObject() = default;
+inline AbstractObject::~AbstractObject() = default;
+
 }
 
 #endif